Magnetic sensor system and lens position detection device

A magnetic sensor system comprising:

• a magnetic field generator configured to generate a target magnetic field;
• and
• a magnetic sensor configured to detect the target magnetic field, wherein
• the magnetic sensor and the magnetic field generator are configured so that a strength of a magnetic field component of the target magnetic field detected by the magnetic sensor in a first direction changes with a change in a position of the magnetic field generator relative to the magnetic sensor,
• the magnetic sensor includes a plurality of magnetoresistive elements,
• the plurality of magnetoresistive elements each include a magnetization pinned layer having a magnetization whose direction is fixed, a free layer having a magnetization whose direction is variable depending on a direction and the strength of the magnetic field component, and a gap layer located between the magnetization pinned layer and the free layer, and are configured so that a bias magnetic field in a second direction orthogonal to the first direction is applied to the free layer, and to change in resistance with the strength of the magnetic field component;
• and
• a maximum strength of the magnetic field component applied to each of the magnetoresistive elements is greater than or equal to 1.2 times a strength of the bias magnetic field.